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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Tax benefits recognized provided percentage of likelihood of realization is more than 50.00%  
Share-based Payment Arrangement, Expense, Tax Benefit $ 62.4 $ 0.2
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent (8.00%) 23.30%